disinterest vs ennui

disinterest

verb
  • To render disinterested. 

noun
  • The absence of interest (bias or stake). 

  • An absence of interest (attention or curiosity). 

ennui

verb
  • To make bored or listless; to weary. 

noun
  • A gripping listlessness or melancholia caused by boredom; depression. 

How often have the words disinterest and ennui occurred in a corpus of books? (source: Google Ngram Viewer )